Usage Example for Serial Assistant-AT Mode-V1.0

Hardware Preparation

• TEL0089 SIM800H GSM/GPRS Shield x 1
• DFR0216 DFRduino UNO R3 x 1

Software Preparation

• Download and install the driver: Click to download driver

Preparation

1. Insert SIM800H module onto Arduino UNO or any other Arduino card;
2. Connect UNO with computer through USB cable
3. Connect UNO power jack with an external power supply, 6-12V @ >500mA.
4. Set the swith to USB.
5. Upload the sketch below，or press the button boot for 2 seconds

void setup() {
  //Set pin 12 as output
  pinMode(12, OUTPUT);
  //GSM power on sequence
  digitalWrite(12, HIGH);
  delay(2000);
  digitalWrite(12, LOW);
}

void loop() {
}

Other Preparation Work

Open the serial monitor or other Serial Assistant software.
Choose "Both NL & CR".

Result

Wait for the NET led to blink as finding net, then you could send some AT commands.
Otherwise please check the external power supply/ SIM card/ switch position, and then RESET the module.